Threading tool



Aug. 30 1927.

C. l.A. JOHNSON THREADING TOOL Filed Jam 9. 1922 2 Sheets-Sheet l /NVEN TOR.-

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Au'g. 30 1927.

C; A. JOHNSON THREADING TOOL Filed Jan. 9, 1922 2 Sheets-Sheet 2 M ai..

INVENTOR:

EY I r ATTORNEY:

Patented Aug. 30, 192.7;

UNETED STATES THREADING Toor..

Application filed January 9,1922.

1') of which the objects herein set out, as well as others, may be attained, is illustrated in.

the accompanying drawings in whichn Figure 1 is a view in central lengthwise section through a threading tool embodying my invention.

Figure 2 is an end view of the same.

Figure 3 is a view in cross section on plane denoted' by broken line 3-3 of Figure 1, the body and actuator being further broken away to'illustrate the construction underneath said plane. y

Figure f1 is ai view in cross section on plane denoted by broken line 4-4 of Figure 1.

Figure 5 is a detail view, scale enlarged, illustrating the construction of the die opener. v Y

Figure 6 is a view of a fragment of the retainingsleeve illustrating the construction 3" of the adjustable connection for the actuator.

Figure 7 is a side view of my improved threading tool.

Figure 8 is a detail perspective view, scale enlarged, of one end of a die holder and a threading die, a die clamp, and a die block shown as disconnected from the holder.

Figure 9 is a detail perspective view of one end of the adjuster.

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herein in connection with a threading tool of the general character of that shown. in and forming the subject matter of patent` issued to me December 18th, 1917, No. 1,- 250,185, the present invention being especially applicable to the device shown in said patent, to which reference is hereby made for such understanding of the construction and operation of the main device as may not be Ispecifically illustrated and described herein.

1n the accompanying drawings the numeral 5 indicates the shank of my improved threading tool that may be secured to the spindle of a lathe in any suitable manner to be driven thereby, or the shank may, in

My linvention is illustrated and described4 Serial No. 527,916.

fact, constitute the spindle of the lathe ifv desired, it being understood that the articles tobe threaded, as the end of a bolt- 6, will beheld in a suitable chuck or other device in a manner that will be readily understood by those skilled in the art. The body 7 of my improved threading tool is attached to the shank 5, or lathe spindle, in any suitable manner, the screw threaded end of the shank engaging a screw threaded opening in the end-of the body .in the means for such attachment shown herein. Grooves '8 are formed through the Ybody at equal distances apart, four grooves being employed in the structure shown'herein. Die holders 9 are located in these grooves, said holders extending through `the body Aand projecting at opposite ends thereof. y

Grooves 10 are formed across the enlarged ends of the holders to. receive threading dies 11, each die having a threaded surface 12 on one side extending out at its beveled end, which end formsl the thread cutting end of each die. A die clamp 13 is located in the groove in each of the holders 9, each clamp having a flat surface to. engage a die on the side opposite the threaded side thereof, a crosswise cut on each clamp forming two beveled clamping or cam surfaces 14, one at each side of the cut. One-side of each slot 10 comprises a projection 15 on each diev holder to be received within the cut in the die clamp appurtenant thereto, one side of the projection havinga beveled clamping or cam surface'l to act upon the cam surface 14 at that side of the cut in the clamp and a clamp screw 17 extends through the projection with its end'in position to act upon the cam surface 14 at the other side of the cut in the holder. A die block 18 may be employed, if desired, to receive the threaded surface of the die in each holder opposite the die clamp therein.

An actuating arm 19 extends from that end of each holder opposite its die supporting end, said arm being preferably formed integralwith the holder. A retaining sleeve 2() having grooves on its inner surface cor-y responding tov the grooves 8 and forming therewith round holes is placed upon the body to retain lthe die vholders in place. Each arm 19 is connected with a die actuator 21 by means of a` ball or balls 22 located between the arm and actuator and arranged to be pressed into Contact with the actuator by a die opener 2d, each opener preferably comprising two balls resiliently connected as by means of a split ring` 25Y within which and between the balls a spacer 2G is placed. By using 'spacers of different thicknesses the lengths of the openers may be adjusted to suit different conditions.

The actuator 2l is provided with a die opening; groove 27, one edge of which is formed into a die opening,` cam 28. Sizing cams 29 are formed in the bottom of the groove 27 for the purpose of rotatably adjustin@ the holders, and hence the position of the dies to properly perform the special work required of them. The actuator also a die closing groove 30, the edge of which is formed into a dio closing` cam, the bottom of said groove being` formed into a set of sizing 82 and the edge of the `@groove Comprisingr said cams being formed into a correspondim,l set of sizing cams 33 against which the die closers 22 rest. its a means of adjListing` the actuator with respect to the die openers and closers, said ctuator has two recesses, one end of each of which comprises an adjustingl shoulder to receive one end ot one of two sets of balls constituting an adjusting' connection 35. An adjuster' 36 is rotatably mounted in the sleeve 20, in the form herein shown said adjuster comprising a bushinO1 having screw threads fitting; a screw threaded openingl in said sleeve. The inner end of the adjuster, comprising' a member rotatably mounted in the bushing, is formed into adjustingl cams 37 and 37a, two being shown in the struct-ure herein oppositely disposed and sloping` in opposite directions when considered with respect to the direction of rotative movement of the adjust r and one appurtenant to each set of balls 35, the cams being` so arranged that when the adjuster is rotated eachy set of balls will be forced to more in a direction opposite to the direction of movement of the other set and to substantially the same extent. The outer end of the adjuster may be provided with means .vhereby it may be turned, as a squared end 38 to receive a wrench, and the adjuster also has graduations 89, as shown in Figure 7, by means of which the degree of turningl movement of said adjuster may be determined.

The actuator 2l may be operated in various ways to effect opening;` and closing;- movenient of the dies, in my patent hereinbefore referred to an actuating rod secured to the actuator having` been employed to effect its movement in both directions. ln the form of device shown herein the actuator is moved the boltor other object being threaded and other means to be hereinafter described are employed to move the actuator .to close the dies.l l The mechanism for effecting these opV as shown herein these fingers projecting" from the end of a sleeve 45. v

rlie inner end of the head is beveled to form an accelerator i6 against 'which the springtingers press when released from the groove l-, this pressure causing a quick movement ot the stem d() and hence of the actuator.

An opening stud L7 is locatedat the end of'an opening' rod extending` within the sleeve 425. 'This rod comprises two members i8 and llt) resting` one aga-inst the other, the meeting edges comprisinfc;` interengaging teeth, as clearly shown in Figure l, the opening stud being located on one of the members i8 that, at this end, 'is of the full diameter of the rod, andthe member i9v atV the opposite end of the rod is also of kthe full diameter thereof, thus providing shoulders on each member againstwhicli the end of the opposite member may abut. The two members of the rod are held in any relative position of adjustment by means of the comparatively close lit within the stem 40 which preventsa separation ofv th'e'rod members.

A hole 50 extends inwardly from a'recess 5l in the outer surface of the enlarged portion 52 at the end of the body opposite the dies, the hole 50 being,` inclined in a radial plane and the recess 51 beingl located at an angle to said hole. An operating sleeve 53 is supported on the enlarged portion 52 of the body, this sleeve beingl p 'eferably held in place by a flange on the shank 5. cam groove 55 is located on the inner surface of the sleeve 53, this groove extending transversely to the recess 5l. A set of balls 56 are located in said hole, recess and groove, and as the sleeve 53 is turned in one direction these balls will be forced 'inwardly against the cam all, thus forcing the .actuator into posit-ion to close the dies, and also to engage the spring ngers ist with the groove 43.

This sleeve may be actuated as by means of a cam arm 57 projecting fromtlf sleeve in position to strike object with respect to which it has relative movement, as a stationary part of a machine on which a turret within which the threading` tool is mounted is rotated to bring successive dies into registering position with the means for holding the piece of met-al being threaded, Vand in Cin which rotation the cam arm is swept past the member by means ot which it is actuated.

A single set of balls 56 have been shown anddescribed herein as a means for operating the actuator, but I contemplate that these may be duplicated to any extent in which case they will be located in proper position with respect to the operating sleeve 53.

It will be noted that the die openers and closers 24-22 rest against sizing cam surfaces 29-82 in the bottom of the grooves in the actuator, as hereinbetore explained, and the adjustment ot said openers and closers to properly position the dies l1 is obtained by slightly turning the actuator one way or the other by operation ot the adjuster to locate said dies closer together or farther apart. This proper adjustment having been obtained and the machine to which the tool is atixed being in operation, the dies l1 and bolt or other device 6 are caused to engage each other and a thread is cut on said bolt. Ihen the thread has been cut of a desired length the space between said bolt and the opening stud 47 is closed and the stud and the actuator 21 to which it is secured will be moved endwise and the opening'cam 28 and openers 24 willbe engaged, thereby rotating the holders 9 and opening the dies. In a reverse movementy ot the parts the arm 57 will be brought into Contact withthe object :tor operating it and will be slightly rotated to force the balls 56, against the cam 4l and move the actuator in a direction to close the dies, aiter which the operation will be repeated. It the dies have been opened or closed they are retained in such positionsby engagement of the spring fingers 44 with the groove 43 or underneath the head 42 and until forced from such positions by movement of the actuator endwise, as hereinbe- Jfore described.

In accordance with the provisions of the patent statutes I have described the principles of operation ot 'my invention, together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that the device shown is only illustrative, and that the invention may be carried out by other means and applied to uses other than those above set out.

I claim- Y l l. A threading tool comprising a body,`die holders rotatably mounted in the body, an actuator movably mounted in the body, and connections between said die holder and actuator and comprising` a plurality of balls with an adjusting spacer between them.

2. A threading tool comprising a body, die holders rotatably mounted in ythe body, an actuator movably mounted in the body, connections between said die holder and actuator and comprising a plurality ot balls with a split ring between two of theballs, and a spacer adjustably placed within the ring and between said balls.

3. A threading tool comprising a` body, die

holders rotatably'mounted in the body, an actuator movably mounted in the body, connections between the die holders and body or'operation ofI said holders, sizing means upon the actuator to permit adjustment et the degree ot n'iovement of the holders, a set oi balls connected withfthe actuator to position said actuator including said siZinO means to change said degree of movement or vthe holders, and means accessible from the surface of the tool to operate said balls tor the purpose named.

4. A threading` tool comprising a body, die holders rotatably mounted in the body, an actuator movably mounted in the body, connections between said actuator and die holders, sizing means upon the actuator to permit adjustment of the degree ol' movement otthe holders, an adjuster accessible at the outer surface of the tool, and a connection between said adjuster and actuator whereby said actuator' including said sizing means are' operated to move the actuator in opposite directions to change the degree of move-- ment of said holders.

A threading tool comprising a body, die holders located in the body, an actuator mounted .in the body and operatively connected with the die holders, said connection including means for changing the position of the die holders byl rotative movement of the actuator, a cam adjuster rotatably mounted in the body and having oppositely arrangedcams, and means connecting said adjuster with said actuator to rotate it in opposite directions.

6. A threading tool comprising a body, die vholders rotatably mounted in the body, an actuator lmounted in the body and operatively connected with the die holders, said connection including means for changing the position of the die holders by rotative movement of the actuator, a cam adjuster rotatably mounted in the body and having oppositely arranged cams, and a plurality of sets ot balls connected with said cams and resting against shoulders on the actuator.

7. A threading tool comprising a body, die holders rotatably mounted in the body to operate dies carried thereby, an actuator movably mounted in the body and operatively engaged with the die holders to rotate them, a member rotatably mounted on the body, and connections between said member and actuator to operate the latter by rotative movement ot said rotatably mounted mei` ber during operation of the tool .to cut a thread. Y

` S. Av threading tool comprising body, die holders rotatably mounted in the body to operate dies carried thereby, an actuatorl Pfl ogy

lraovalfiy mounted in the body and operamounted on the body and having a cam surtaie, and a. plurality ot balls extending between said cam surface and said actuator to ell'ect en-dvfise movement ot the latter by reason of rotative movement ot' said member.

l0. i threading tool comprising a body having` a hole extending diagonally into a central opening therein, die holders n'iovably mounted in the body., an actuator movable lengthy-rise within said opening, a cam sur tace located on vthe sido ot the actuator', an operating member rotatably mounted on the bodv and havin@ a earn recess registering 'ith said hole, and a set ot' balls located in said hole and recess to eli'ect an operative connection between said member and said actuator. i f

ll. A. threading tool comprising a body, die holders niovably mounted in the body to operate dies carried thereby, an actuator movable lengthwise within the body to acsaid holders tor opening and closing movements, means located within the body and adapted to be moved to resiliently engage said actuator and retain it in one position, and means to operate the actuator to torce it from engagement with said retaining meant-5.

l2. A threading tool comprising a body, die holders inovablj-,i mounted in the body, an actuator movable lengthwise within the 1Jody and operatively connected with said o ters, an actuatorstem rigidly connected with the actuator and having a groove, spring actuated retaining members located within the body and having lingers to ensfiid groove to retain the actuator' in one position, and means 'for moving the actuator to it from said lingers.

13. l threading tool comprising a body, die holders movably mounted in the body, an actuator mounted in the body and operatively connected with said holders, means located within the actuator to operate it and comprising two members extensible one with respect to the other, and means tor retaining saidv members in dillerent relative positions.

lll. il.. threading tool comprising a body, die holders movably mounted in the body, an actuator movably mounted in the body and operatively connected with the die holders, and an actuator voperating member located within theactuator and comprising' two parts extensible one with respect tothe other and having toothed meeting surfaces.

l5. A threading tool comprising a body,I a die holder rotatably mounted in the body and having a groove therein, a die clamp located in said groove to retain a die in place,Y said clamp having 'opposing camV suritaces, and means acting upon one ot' said -cain sur- Jaces to 'force the clamp into engage with'the tool and to ,press the other cam surface against an opposiro` member.

16. A threading tool comprising a bodv, a die Liolder rotatably mounted in the body and having a groove in its end forming a projection with a cam-surface thereon, die clamp locator. in said groove and having op posing cam surfaces one ot which engages the cam surface on said projection, and means 'forcing the clamp against said too-l ant said 'am surfaces one against the other.

'hreading tool comprising a body', die holders rotatably niountedV in the body, an actuator movably mounted in the body, connections between said die holder and act mtor and' comprising a plurality of balls u; h a. split ring between two ,of the balls, and a spacci.' located within the ring and between said balls.

1S. A threading tool' comprisinga body,`

die holders rotatably mounted in the boc y, an actuator niovably mounted in the body, connections between said die holderand body lor operation otsai L holders, means upon the actuator to permit adjustment to change the amount i member 'accessible from the surface ot the .tool tor etliecting said adjustment, 'and an operative connection between said member and said adjusting means upon the actuator.`

and having oppositely ext-ending sizing camV suriiaces, a die opening connection between one ot said cam surfaces and a die holder, die closing connection between the other of said camsurfaces and die holder, and means 'for rotatively adjusting the position ot' said actuator' to change the'amount, of rotative movement ot the actuator.

errantes a.V Jonsson.

movement of the holder?,

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